Riveting press



Jan. 27, 1931. v THwEATT 1,790,029

RIVETING PRES S Filed ma s, 1928 3 Sheets-Sheet 1 Jan. 27, 1931.

H. D. THWEATT 1,790,029

RIVET'I NG PRESS Filed May 5, 132a s sne'ets-sneet a m L JIM 1 W n 5 VFW; 19 am Patented Jan-27, 1931 I mnnm n. Tamer, or Henson, omo,

jnssrenon TO THE ADAMQN j 'nrvnrme- PRESS Application filed m a,

Y The invention relates to riveting presses,

and may be'especia-lly adapted to a press for riveting laminations such as poles for motors,

generators and the like; although it is equally adapted for riveting any kind of plates or- Iaminations: p 3: H

It is common practice in, riveting together laminations suchas thepoles for; largejmotors, generators andthe like, to clamp the laminations together by means of clamps and upset the rivets by hand or singly by a press.

Itvis present practiceto do such riveting with rivets having a head already formed upon one end before the rivets are inserted through the lamination's, the other end of,

the rivet being upset in the riveting operation. As a result,- one' endportionofeach rivet is not enlarged, by the upsetting, to fill the 'holes in the laminations. The object of the improvement isto provide a press of this character having, means for centeringthe rivets'through a pack of jlaminations whereby fixed amounts of each rivet may project beyond opposite sides of the packrof laminations, means being pro vided for pressing the laminations tightly together and separate means being provided same;

for upsetting'the rivets at both sides ofthe "laminations. 7 7

',.An embodiment of the invention such as adapted for riveting laminations isaillustrated in, the accompanying drawings, in which V Figure 1 is a side elevation of provedriveting press; a

Fig, 2, avertical sectional view of the the ini- Fig. 3, an enlarged fragmentary section through portions ofithe upper head, bolster,

insert plates, riveting pins and rams, showing' a pack of laminations in position to be riveted; and

throughout the drawings.

Fig. 4, a similar view, showing the parts in theoperated position.

Similar numerals refer to similar parts The improved press may comprise vthe base 1,,mounted upon any suitable support such as indicated generally at 2, which may belocatedwithin a pit or the like, a as at 3,

192a. se iaino; 274,791. 1

x V v Acnnvn coi :-v

o ranger Anson, onro, nfconromrron 030310;: Y

the top of the basebeing substantially flush with the floor level 4;; 7 v

Uprightg uide rods 5 are connected to the corner portions of'thebas'e and support'the head, shown-generally at 6,: injfixed spaced relation tothebase, at their'upper portions.

The base may be provided atea'ch side 'Witha" fluidcylinder? withinwhich is located a ram orpiston '8, supporting the 7 end portions of the bolster 9, for vertical movement'qbetween the guide rods 5. 4

A fluid supply pipe 10 communicates withboth of the-fluid cylinders"7,1asindi- V ,cated atll, and a valve l2 controls the admission of fluid underpressure to said cylinders; The amount of pressure inthecylinder's-may be indicated as by the gauge 13.

An insert plate ltisje'arried by the bolster 9 and may be provided with the shouldered portion l5 seated within the recess 16o'f the bolster and movable therewith,

A plurality ofriveting pins1-17,:-corref spending in :number and position to the 'rivportion as at 19 to receive the enlarged head i 20 of the riveting pin, which is adapted to normally rest upon the shoulder 21 of the openings to prevent the pin from dropping downward out of the-insert plate, A fluidcylind-er 22, preferably of considerably largerdiametfer than the cylinders 7 is centrally-located in the base lwand provided with ramv or piston 23, theupper GIId'O-f which may be slightly reduced as at 24and extended through the central opening 25 in the bolster, a ramvcap 26 being adapted to be engaged by the upper end of the ram. I v

This'ram cap is arranged to beseated upon the shoulder27' in the bolster. to limit the downward movement of the ram cap with reference to the bolster, whereby the space between thebottom off the insert plate 14 and the top of the'ram cap 26 is normally constant.

, A fluid supply pipe 28 communicates with thecylinder 22, admission of fluid thereto i being controlledas by the valve 29. A gauge of pressure in the cylinder.v

with the riveting pins 17.

An upper insert plate 31 is fixed within the upper head 6 of the press and provided with a plurality of riveting pins 32, corresponding in number and position to the'pins Y17 and slidably located through the vertical opening 33 in the insert plate.

Heads 34 are provided upon the upper ings 33, in ordertolimit the ment of the pins.

Thesepins as well asthe pins l'lfrnay beshaped at their riveting ends to'produce the desired shape of rivet: head. In the drawings-these pins are shown shaped as at 36 adapted to form heads uponthe rivets as shown at 37 in Fig. 4, this being-one form of rivethead that may be made thereby; i v

A fluid cylinder-38 is carried by theupper head 6 and connected to the gauge '3O," and valve 29, as by-a'pipe 39, by meansof which fluid may be admitted simultaneously to the cylinders 22 and 38.

A piston or ram 4 0 is mounted within the cylinder 38 and adapted to operate upon the ram cap 41'to move the same downward toward-the insert plate 31, the ram cap-contacting with the upper ends of the riveting pins-32.. I

- With the press in the normal orinitial position, as shown in Fig. 2, a pack of laminations to be riveted, with the rivets located therethrough, is placedin position upon the lower insert plate 14, the rivets registering A fragmentary'portion of such pack of laminationsis shown at 42 in Figs. '3 and 4. The laminations' are provided with apertures '43 registering with each other'to receive the rivets44. r i As shown in Fig. 3, these apertures are slightly larger than the rivets, permitting them to be easily and readily inserted through the laminations by hand.

In placing these rivets through the laminations it isimpossible to accurately center each rivet through the laminations, that isto say, 'equalamounts of each rivet'do not ordinarily protrude from opposite sides of the pack of .laminations. l

, With the construction of press disclosed herein, this lack of uniformity of the amount of rivet projecting from each side of the laminations is compensated for. This is. accomplished by permitting movement of the ram caps 26 and 41Withrespect to the insert plates 14 and 31 respectively, and limiting the maximum movement between the ram caps and insert plates as by the shoulders 27 and 45 in the bolster and upper headrespectively.

V The distance between the top of the insert plate 14 and the shoulder 27 is constant and the distance between the bottom of the insert downward mov plate 31 and the shoulder 45 is constant.

These distances'must be equal where the heads to be formed at both ends of the rivets are the same. i V 7 Thus when the pack of laminations is placed upon 'th'e lower insert plate, in proper position as above described, and fluid admitted to the cylinders 7, the rams 8 will I raisethebolster 9, bringing thetopwot the ofthe pins 32, adapted tocontactwith the shoulders 35, in the upper ends of the open packet fla-minati'ons into" contact with the upper insert plate 31, sufucient pressure being i applied to clamp these laminations tightly together in the position shownin Fig. 3.

.=' Qppositeendslot the rivets 44 will contact with the upper and lower rivetingpins 32 :and 17 respectively and'these'rivets will be properly centered through thepack o'f laminationsas illustrated in-Fig.-3.

This'jis accomplished' by the lower rlveting pins 17 being forced downward against the lower ram cap 26 which rests upon the shoul-' der '27, while the upperriveting pins 32 5 will be forced upward, raising the upper ramcap 41 until it contacts with the shoulder-45.- v

' Equal amoun'ts of each rivet 44 willthus project beyond each side of thelaminations.

The-'pressuregis held upon the-cylinders 7, holding the'laminations clamped tightly together and pressure is then applied to-thecyl- 'inders 22 and 38, raising the-ram 23 andlowering the ram- 40" simultaneously, with pressure equalized on both rams." I The movement of these rams forces-thermeting pins 17' upwardand the riveting-pins 132downward, riveting heads '37 upon {the rivets 44 as illustrated in Fig. 4.

Allof'these heads-upon the rivets will'be of uniform size and shape, being formed from an equal-amount of metal and. furthermore, the rivets- 44 will be shortened and slig'htly"enlarged in diameter, causing the same to tightly fit within the openings 43 in I thelamina'tions asillustratedinFig: 4. The pressure is then released from-all of :thel'cylinders and the parts permittedto return tothe normal position'when' the riveted packet laminations may be removed from the press. v v k w i From the above, it will beobvious that a plurality ,of rivets besimultaneously centered and riveted, clamping the laminations together in a single operation of thje improved press.

Although the press is' illustrated and de-. scribed as a vertical press with the bolster andrams running vertically, it should be 'understoodthat the inventionis not limited to a vertical press, but thattheentire press may be located in a horizontal. or other position without departing from the spirit or sacriticing any of the advantages of the invention. a I

- It. should also beunderstoodthat'the press is applicable'to'the riveting of any'number' of platesor laminations of any thickness and"-;

shape, and of any material,metallio'0r nonmetallic.

Although the press as illustrated is adapted to form similar heads upon each end of the rivet, it should be understood that in case it is desirable to form heads of different. .size or shape at opposite ends to the. rivet,

this may be accomplished by so spacing the shoulders 27 and 45, with reference tothe respective insert plates, that the desired amount of each'r vet will protrude through each side of the pack of laminations.

I claim 2' I a j 1 1 1. A press including a fixed head, an'lnsertplate 1n the head, riveting pins inthe 1n- 7 sert plate, 1a bolster movable toward and from the head, an. insert plate in the bolster,

riveting pins in said last named insert plate, ram caps movably mounted in the head and bolster for contact with the riveting pins, shoulders in the head and bolster for limiting outward movement of the ram caps, and means for moving the ramcaps axially toward each other. a o

2. A press includinga fixed head, an'insert plate in the head, rivetingpins in the insert plate, a bolster movabletoward and from the head, an insert'plate in the bolster, riveting pins in said last named'insert plate; ram caps movably mounted in the head and bolster for contact with the riveting pins, shoulders in the head andbolster for uniformly' limiting outward movement of the ram caps, and means for movlng the ram caps axially toward each other;

3. A press including a fixed head, an insert 1 platein the head, riveting pins in the'insert ders in the head and bolster for limiting outward movement of theram caps, and rams other. 6; A

press including a fixed head, an insert plate in the head, riveting pins in the insert plate, a bolster movable toward and from the head, an insertplate in the bolster, riveting pins in said last named insert plate, ram

l caps movably mounted in the headand bolster for contact with the riveting pins, shoulders in the head and bolster for uniformly limitmg outward movement of the ram caps, and. rams for moving the ramcaps axially toward each other.

for moving the ram caps axiallyto'ward each 'ster for contact with the riveting pins, shoul- 7. A press including a fixed head,;an in- I sert plate in the head, riveting pins in the in sert plate, a bolster movable toward and from 1 I the head, an insert plate in thefbolster,'riveting pins in said last namjed insert plate, ram

caps movably mounted in the head aridbolster for contact with the riveting pins, shoul ders in the head and bolster for limiting outward movement of the ram caps, rams for ,moving the bolster toward the head,

and rams for moving the'ram caps axially t0- ward each other.

In testimony that I claim the hereunto subscribed my-name.

.HARD IN D. THWEATT.

plate, a bolster movable toward andfrom the v head, aninsert, plate in the bolster, riveting pins in said last named insert plate, ram caps movably mounted in'the head and bolster'for contact with the riveting pins, shoulders in V the head and bolster for limiting outward movement of the ram caps, means for moving 4 the bolster toward the'head, and means for moving the ram caps axially toward each other.

4. A press including a fixed head, an insert plate in the head,sriveting pins in the insert plate, a bolster movable toward and from the head, an insert plate in the bolster, riveting pins in said last named insert plate, ram caps movably mounted in the head and bolster for contact with the riveting pins, shoulders in the head and bolster for uniformly above, I have 

